Paraffin bag



July 21, 193%. s R Howmg 2,048,122

PARAFFIN BAG Filed Aug. 3, 1934 Patented July 2l,V 1936 PATENT OFFICEPARAFFIN BAG Stanley B. Howard, Milton, assignor to Pneumatic ScaleCorporation, Limited, Quincy, Mass., a corporation of MassachusettsApplication August 3,

Claims.

This invention relates to a paraffin bag, and more particularly to aparafiin liner for a carton. The invention has for an object to providea novel construction of bag possessing superior moisture-resistingproperties, which may be economically manufactured and is particularlyadapted for use as a paraiiin liner for a carton. With this generalobjectin view and such others as may hereinafter appear, the inventionconsists in the paraffin bag and in the paraffin liner fora cartonhereinafter described and particularly defined in the claims at theA endof this speciilcation.

In the drawing illustrating theinvention as embodied in a paraffin linerfor a carton, Fig. 1 is a perspective with portions broken away,`illustrating the liner with the carton; Fig. 2 is a similar viewillustrating the liner ready for introduction into the carton; Fig. 3 isa plan of a paraffin coated p aper web from which the present liner maybe produced; Fig. 4 is a view in side elevation illustrating the linerin its partially completed condition; Fig. 5 is a plan view of the nnerin' the condition shown in Fig. 4; and Fig. 6 is an end elevation of thelower portion of the liner shown in Fig. 4.

Prior to the present invention, many attempts have been made to producea satisfactory param liner for a carton, but the results of all of theseattempts have for one reason or another been commerciallyunsatisfactory. The general commercial practice has been to produce theparaffin liner from a web of paraiiin paper by folding the web to form abag rectangular in section and with overlapping side seams and then toapply heat to the side seams to fuse the paraiiin to cause theoverlapping portions to adhere together. The eifect of the heat whenapplied to the overlapping side seams has been to melt the paraflin andcause it to run from the overlapping strip leaving an overlapping sideseam at each side of the liner which is deficient in parain, and in mostinstances the resulting side seams are converted into substantiallyuncoated strips possessing little or no moisture resistance anddestroying most of the effectiveness of the paraffin lin'er as amoisture-resisting agency.. The packaging of certain types ofhygroscopic material hasl presented very serious packaging problems, andthe use of paraffin liners has been resorted to in the attempt toprovide a satisfactory moistureresisting liner and package, in order toprevent access of the moisture-laden air into the interior of thepackage. When the continuity of the coating of paraffin is substantiallydestroyed by 1934, serial No. 738,257

the application of heat to the side seam. even though enough parafdnremains upon the side seam to effect the adherence of the overlappingportions of the seam, nevertheless through this deficient strip themoisture-laden air can readily 5 pass,l destroying the effect which issought to be produced by the use of the paraffin liner.

Other attempts to solve the problem have' included the use of specialadhesives, but these materials have all included solvents whose pungentodors have rendered their use prohibitive for the packaging of foodproducts.

In accordance with the present invention the improved bag is produced ofa unitary length l0 of paper provided upon both surfaces thereof l5 withcoatings l2 of paraiiin or equivalent waterproong material of asubstantial thickness sufiicient to effectively resist the passage ofmoisture through. The paraflin coating upon that surface of the sheetwhich is to constitute the inner surface of the liner or bag is arrangedto terminate at a line I4 spaced from each marginal edge I5 of the sheeta distance corresponding to the desired width of side seam to beproduced in the bag when formed. This produces at each marginal edge ofone surface of the sheet a strip which is free or substantially freefrom paraffin.

In producing the present bag, the unitary length I0 of the parafn-coatedpaper is then 3o folded preferably to form a rectangular shaped bag, andthe folds are made so as to bring into contact the two substantiallyparain-free strips or surfaces, and the latter are adhesively aixed toeach other by glue or other adhesive, producing a strong and durableside seam. In addition, the formation of the bag is arranged so that thecoating l2 of parain upon the inner. surface of each half of the bag isbrought into abutment or contact as at 20, 2i, so that as a result ofthis construction the ultimate bag is provided with an interior coatingof parain which extends entirely around the entire inner surface thereofand forms a complete moisture-resisting barrier of substantialthickness, rendering the paraffin bag thus produced highly eicient as amoisture-resisting container, and particularly as a moisture-resistingliner for a carton or package.

After the side seams have been adhesively aiiixed 'together by glue,producing an exceptionally strong paper to paper contact and seam, theside seams may and preferably will be folded into contact with the endsurfaces of the bag in the manner illustrated in Fig. 1, and theprojecting lower portion of the sides of the bag folded 55 up into theposition shown in Figs. 1 and and as a result the complete paraiiinliner thus formed is ready to be inserted into the package.

The present construction of bag, involving the formation thereof from asingle unitary length of coated paraiiin web, produces a mostsatisfactory moisture-resisting bottom of the bag. Here- `tofore,considerable difficulty has been experiadhesive in the production ofside seams.

While the preferred form of the invention has been herein illustratedand described, it will be understood that the invention may be embodiedin other forms within the scope of the following claims.

Having thus described theinvention,- what is claimed ls: l

1. A moisture-resisting bag comprising a body portion formed of aunitary length of paper coated on both sides'with a layer of parain ofsubstantial thickness and having the marginal portions of the surfacewhich is to form the interior of the bag substantially free from paran,said paper length being folded in such a manner as -to permit theparaffin-free surfaces to be brought into contact and adhesively securedtogether to form outwardly projecting side seams and in such a mannerthat the paraffin layer on the'interior of one half section of the bagwill meet with the corresponding parafn layer-of the other section,whereby the bag is provided with a wall of parafiin o'f substantialthickness over the entire inner surface thereof.

2. A moisture-resistingbag comprising a body portion including sideportions and formedgof a unitary length of paper coated on both sideswith a layer of parafdn of substantial thickness and having the marginalportions of the vsurface which is to form the interior of the bagsubstanis provided with a wall of parain of substantial thickness voverthe entire inner surface thereof,

said outwardly projecting side seams being folded against the sideportions of the bag.

3. A parailin coated bag composed of a single parain-coated paper sheetfolded to form the body of the bag and to form outwardly projecting sideseams extending lengthwise of the bag, the contacting faces of the paperforming said side seams being paramn-free and tightly glued tothe bodyportion of the bag with a uniform and moisture-resisting paraln coating.

4. A moisture resisting bag of the seamless bottom type comprising aparafiin coated paper sheet having its side edges folded to form sideportions with outwardly projecting margins extending lengthwise of thebag, said margins having their contacting faces substantiallyparafiinfree and adhesively and tightly affixed to one another to formside seams with the parafn layer on the interior ofv one half section ofthe bag meeting with the corresponding parailin layer on the otherhalf-section of the bag, said side seams being'folded against opposedside portions of the bag. f

5. A moisture-resisting bag comprising a paramn-coated sheet folded toform the body of the bag with outwardly projecting side seams extendinglengthwise of the bag, the contacting faces of the paper forming saidside seams being substantially paraiiin-free and adhesively and tightlyailixed` to one another whereby to form a bag possessing a high degreeof moisture resistance.

STANLEY R. HOWARD.

' gether whereby'to provide the entire interior of

